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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-limit-token-count-tokenfilter.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-limit-token-count-tokenfilter.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/analysis-limit-token-count-tokenfilter.html" rel="nofollow" target="_blank">../en/analysis-limit-token-count-tokenfilter.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<h2 class="title">
<a id="analysis-limit-token-count-tokenfilter"></a>Limit token count token filter<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc">edit</a>
</h2>
</div></div></div>

<p>Limits the number of output tokens. The <code class="literal">limit</code> filter is commonly used to limit
the size of document field values based on token count.</p>
<p>By default, the <code class="literal">limit</code> filter keeps only the first token in a stream. For
example, the filter can change the token stream <code class="literal">[ one, two, three ]</code> to
<code class="literal">[ one ]</code>.</p>
<p>This filter uses Lucene’s
<a href="https://lucene.apache.org/core/8_5_1/analyzers-common/org/apache/lucene/analysis/miscellaneous/LimitTokenCountFilter.html" class="ulink" target="_top">LimitTokenCountFilter</a>.</p>
<div class="tip admon">
<div class="icon"></div>
<div class="admon_content">
<pre class="literallayout"> If you want to limit the size of field values based on
_character length_, use the &lt;&lt;ignore-above,`ignore_above`&gt;&gt; mapping parameter.</pre>

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<h3 class="title">
<a id="analysis-limit-token-count-tokenfilter-configure-parms"></a>Configurable parameters<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="literal">max_token_count</code>
</span>
</dt>
<dd>
(Optional, integer)
Maximum number of tokens to keep. Once this limit is reached, any remaining
tokens are excluded from the output. Defaults to <code class="literal">1</code>.
</dd>
<dt>
<span class="term">
<code class="literal">consume_all_tokens</code>
</span>
</dt>
<dd>
(Optional, boolean)
If <code class="literal">true</code>, the <code class="literal">limit</code> filter exhausts the token stream, even if the
<code class="literal">max_token_count</code> has already been reached. Defaults to <code class="literal">false</code>.
</dd>
</dl>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-limit-token-count-tokenfilter-analyze-ex"></a>Example<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>The following <a class="xref" href="indices-analyze.html" title="Analyze API">analyze API</a> request uses the <code class="literal">limit</code>
filter to keep only the first two tokens in <code class="literal">quick fox jumps over lazy dog</code>:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">GET _analyze
{
  "tokenizer": "standard",
    "filter": [
    {
      "type": "limit",
      "max_token_count": 2
    }
  ],
  "text": "quick fox jumps over lazy dog"
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/953.console"></div>
<p>The filter produces the following tokens:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ quick, fox ]</pre>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-limit-token-count-tokenfilter-analyzer-ex"></a>Add to an analyzer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>The following <a class="xref" href="indices-create-index.html" title="Create index API">create index API</a> request uses the
<code class="literal">limit</code> filter to configure a new
<a class="xref" href="analysis-custom-analyzer.html" title="Create a custom analyzer">custom analyzer</a>.</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT limit_example
{
  "settings": {
    "analysis": {
      "analyzer": {
        "standard_one_token_limit": {
          "tokenizer": "standard",
          "filter": [ "limit" ]
        }
      }
    }
  }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/954.console"></div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-limit-token-count-tokenfilter-customize"></a>Customize<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>To customize the <code class="literal">limit</code> filter, duplicate it to create the basis
for a new custom token filter. You can modify the filter using its configurable
parameters.</p>
<p>For example, the following request creates a custom <code class="literal">limit</code> filter that keeps
only the first five tokens of a stream:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT custom_limit_example
{
  "settings": {
    "analysis": {
      "analyzer": {
        "whitespace_five_token_limit": {
          "tokenizer": "whitespace",
          "filter": [ "five_token_limit" ]
        }
      },
      "filter": {
        "five_token_limit": {
          "type": "limit",
          "max_token_count": 5
        }
      }
    }
  }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/955.console"></div>
</div>

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